I've been doing a work-oriented "what I did today" list for ~25 years, and really like it. Originally it started because I needed to bill for my time, but when I went to my current job (over a decade ago) I kept doing it. In my iteration, it is a concise sentence about each thing I've worked on that day. At the end of the month I go back through and review it and write up a "Wins" list.

It's surprisingly useful; I share it with my coworkers and we often consult it if we notice something has been behaving differently starting at a certain date to see what was going on then.

I keep it in a simple text file, running in a tmux on a server, so I have connections to it from my laptop and my desktop. It's currently 19,509 lines.